"I can't wait to encourage you, and tell you that you're the most amazing person in the world, and that you can do anything or be anything you want to be," he wrote. "I'll be there for yor first tears, your first bump and bruise. I'll be there for your first steps, your first words and your first day at school.

"I'll be there for your first broken heart, your first award, your first car, I'll be there for your wedding day, and I'll be there for your firstborn. I'll be there first. For you."

McDermott added: "With all my love and devotion, I will fight tooth and nail to give you the wonderful life you deserve. Because you have made my life wonderful beyond my dreams by being my child, a little angel that has found your mother and I and blessed our lives with beauty and grace. I will give you my last breath, as you have given me my first."

Spelling and McDermott are also parents to Liam, 5, Stella, 4, and Hattie, 10 months.